Exercise bike



FIG. 1 is a perspective view of an exercise bike showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a left side perspective view thereof.

The broken lines in the drawings depict portions of the exercise bikethat form no part of the claimed design.

CLAIM The ornamental design for an exercise bike, as shown anddescribed.